package com.example.filter;

import com.alibaba.fastjson.JSON;
import com.example.common.BaseContext;
import com.example.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER =new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
//        filterChain.doFilter(request,response);



        //获取本次请求的uri
        String requestURI = request.getRequestURI();
        log.info("拦截到请求："+requestURI);
        //定义不需要处理的请求路径
        String[] uris=new String[]{
           "/employee/login",
           "/employee/logout",
           "/backend/**",
           "/front/**",
           "/common/**",
           "/user/sendMsg", //移动端发送短信
           "/user/login"   //移动端登录
        } ;
        //判断本次请求是否需要处理
        boolean check1 = check(uris,requestURI);
        //如果不需要，直接放行
        if (check1){
            filterChain.doFilter(request,response);
            log.info("拦截不需要请求："+requestURI);
            return;
        }
        //后台如果已登录就直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录id:"+request.getSession().getAttribute("employee"));

            long id = Thread.currentThread().getId();
            log.info("线程id:{}",id);
            Long empId =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        //移动端如果已登录就直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录id:"+request.getSession().getAttribute("user"));

            long id = Thread.currentThread().getId();
            log.info("线程id:{}",id);
            Long userId =(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //如果未登录则返回登录界面，通过输出流方向向客户端界面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 匹配路径检查本次请求是否需要放行
     * @param requestURI
     * @param uris
     * @return
     */
    public boolean check(String[] uris,String requestURI){
       for(String uri : uris){
           System.out.println(uri);
           boolean match = PATH_MATCHER.match(uri,requestURI);
           if(match){
               return true;
           }
       }
       return false;
    }
}
